Work on composition. Don't do Macro shots. It won't improve your photography skill.
Abduct posted good examples about centering, portraits and rule of thirds.
Best way to improve is by shooting stationary objects first and then people.
Photography is not only about taking photos. It could go as far from basic of rules of art.
It's ok to have fun with your camera but make sure you experiment with shooting Manual. If you learn to shoot manual I guarantee you'll get really nice photos.
P/S/A and Auto modes suck. You can use P/S/A mode when you do street photography (places like hong kong or downtown) since you wont have time moving your dials while things are in motion. That is when your judgement of composition needs to shine.
Autofocus is ok though... its more accurate for most ppl.
If you have access to photoshop or lightroom, shooting RAW is a must. If you got a a nice sharp clean shot you could alter it later to make it look even more nice and how you want it to look instead of having the camera process it for you.
I recommend this since your starting photography, its best practice to learn it professionally at the same time
This post was edited by Irresistable on Dec 27 2012 10:52pm